Leakage circuit breaker model
5SM/KOOC-0//KOOC-0//KOOC-0/0 Residual Current Protection Circuit Breaker (/KOOC-0/25V ~ 230V)/KOOC-0/6A2p/KOOC-0/0MAAC 55mm.
5SM/KOOC-0//KOOC-0//KOOC-0/6 Residual Current Protection Circuit Breaker (/KOOC-0/25V ~ 230V)/KOOC-0/6A2p/KOOC-0/0MAA 55mm.
5SM/KOOC-0/3/KOOC-0//KOOC-0/6 Residual Current Protection Circuit Breaker (/KOOC-0/25V ~ 230V)/KOOC-0/6A2P30MAA type 55mm.
5SM 13 120 Residual Current Protection Circuit Breaker (125V ~ 230V) 25A2P30MAAC 55mm
5SM 13 126 Residual Current Protection Circuit Breaker (125V~230V)25A2P30mAA 55mm
5SM 13 140 Residual Current Protection Circuit Breaker (125V ~ 230V) 40AP 30MAAC 55mm
5SM 13 146 Residual Current Protection Circuit Breaker (125V ~ 230V) 402P30MAA 55mm
5SM 13 160 Residual Current Protection Circuit Breaker (125V ~ 230V) 63P2P30MAAC 55mm
5SM 13 166 Residual Current Protection Circuit Breaker (125V ~ 230V) 63P2P30MAA 55mm
5SM 13 170 Residual Current Protection Circuit Breaker (125V ~ 230V) 802P30MAAC 55mm
5SM 13 176 Residual Current Protection Circuit Breaker (125V ~ 230V) 802P30MAA 55mm
5SM 13420 Residual Current Protection Circuit Breaker (230V~400V)25A4P30mAAC 55mm
5SM 13426 Residual Current Protection Circuit Breaker (230V~400V)25A4P30mAA 55mm
5SM 13440 Residual Current Protection Circuit Breaker (230V~400V)40A4P30mAAC 55mm
5SM 13446 Residual Current Protection Circuit Breaker (230V~400V)40A4P30mAA Type 55mm
5SM 13460 Residual Current Protection Circuit Breaker (230V~400V)63A4P30mAAC 55mm
5SM 13466 Residual Current Protection Circuit Breaker (230V~400V)63A4P30mAA Type 55mm
5SM 13470 Residual Current Protection Circuit Breaker (230V~400V)80A4P30mAAC 55mm
5SM 13476 Residual Current Protection Circuit Breaker (230V~400V)80A4P30mAA Type 55mm
5SM 13526 Residual Current Protection Circuit Breaker (500V)25A4P30mAA Type 55mm
5SM 13546 Residual Current Protection Circuit Breaker (500V)40A4P30mAA Type 55mm
5SM 13566 Residual Current Protection Circuit Breaker (500V)63A4P30mAA Type 55mm
5SM 14 120 Residual Current Protection Circuit Breaker (125V ~ 230V) 25A2p100MAAC 55mm
5SM 14 126 Residual Current Protection Circuit Breaker (125V ~ 230V) 25A2p100MAA 55mm.
5SM 14 140 Residual Current Protection Circuit Breaker (125V ~ 230V) 40P2P100MAAC 55mm
5SM 14 146 Residual current protection circuit breaker (125V ~ 230V) 40P2P100MAA type 55mm.
5SM 14 160 Residual Current Protection Circuit Breaker (125V ~ 230V) 63P2P100MAAC 55mm
5SM 14 166 Residual current protection circuit breaker (125V ~ 230V) 63P2P100MAA type 55mm.
5SM 14 170 Residual Current Protection Circuit Breaker (125V ~ 230V) 80P2P100MAAC 55mm
Working principle of leakage circuit breaker
Composition and working principle of leakage circuit breaker The leakage circuit breaker has two functions, one is the function of circuit breaker and the other is the function of leakage protection. The function of the circuit breaker is the same as that of the general low-voltage circuit breaker, and it is used as a switching appliance that is not often operated. The residual current is detected by the zero-sequence transformer in the leakage protection part, that is, the change of leakage current to the ground is judged by detecting the instantaneous current values of the phase line and neutral line in the protected circuit at the side.
When the leakage current of the circuit exceeds the specified value or someone gets an electric shock, it can automatically cut off the power supply in a safe time, protect the electrical appliances, ensure personal safety, and prevent the equipment from causing fires and other accidents due to leakage current. The leakage circuit breaker consists of operating mechanism, electromagnetic release, contact system, arc extinguishing chamber, zero-sequence current transformer, leakage release and test device, all of which are installed in an insulating shell. The leakage protection function of small circuit breaker is modular and provided in the form of leakage accessories.
There are two kinds of leakage tripping devices: electromagnetic (ELM) and electronic (ELE). The difference between them is that the leakage current of the former can directly operate the main switch through the trip, while the leakage current of the latter can only be amplified through the electronic amplifier circuit to make the trip operate the main switch.
Selection principle of leakage circuit breaker
According to the purpose of use and the location of electrical equipment.
1) to prevent direct contact with electric shock
Because direct contact and electric shock are extremely harmful and have serious consequences, the leakage circuit breaker with high sensitivity should be selected. For electric tools, mobile electrical equipment and temporary lines, leakage circuit breakers with operating current of 30mA and operating time of 0. 1s should be installed in the circuits. Residential buildings with more household appliances should be installed behind the household watt-hour meter.
If electric shock may cause secondary injury (such as aerial work), a leakage circuit breaker with the operating current of 15mA and the operating time within our scope should be installed in the circuit. For electrical medical equipment in hospitals, leakage circuit breakers with working current of 6mA and working time within the scope of the United States should be installed.
2) Indirect contact electric shock protection
Indirect contact and electric shock in different places will cause different degrees of harm to people, so different leakage circuit breakers should be installed in different places. For places that are easy to get an electric shock and harmful, it is required to use leakage circuit breakers with high sensitivity. The danger of getting an electric shock in a wet place is much greater than in a dry place. Generally, leakage circuit breakers with operating current of 15-30mA and operating time of 0. 1s should be installed. For electrical equipment in water, leakage circuit breakers with working current of 6- 10 mA and working time within the scope of the United States should be installed. For electrical equipment whose operators must stand on metal objects or in metal containers, as long as the voltage is higher than 24V, leakage circuit breakers with operating current below 15mA and operating time within the scope of the United States should be installed. For fixed electrical equipment with voltage of 220V or 380V, when the grounding resistance of the shell is below 500fZ, a single machine can be equipped with a leakage circuit breaker, the operating current is 30mA, and the operating time is within 0. 19. For large electrical equipment with rated current above 100A or power supply circuits with multiple electrical equipment, a leakage circuit breaker with working current of 50- 100 Ma can be installed, and a leakage circuit breaker with working current of 200-500mA can be installed when the grounding resistance of electrical equipment is below 1000.
According to the normal leakage current of circuits and equipment.
1) single earth leakage circuit breaker. The working current should be 4 times of the leakage current when the equipment works normally.
2) The action current of the leakage circuit breaker used in the branch line should be 2.5 times greater than the leakage current during normal operation of the line and 4 times greater than the leakage current of the electrical equipment with the largest leakage current in the line.
3) The action current of the main line leakage circuit breaker or the total protection of the whole network should be 2.5 times greater than the leakage current during the normal operation of the power grid.
If it is not easy to measure the leakage current of lines or electrical equipment, it can be estimated according to the following empirical formula:
Lighting circuit or residential power circuit: action current of leakage circuit breaker IDZ >；; ISJ/2000；
Hybrid circuit of power and lighting: action current IDZ of leakage circuit breaker >: isj/1000.
In the formula, IDZ is the operating current of the leakage circuit breaker, and ISJ is the maximum current in the circuit.
1) The electric equipment powered by single-phase 220V power supply should choose bipolar double-wire or unipolar double-wire leakage circuit breaker.
2) Three-pole four-wire or four-pole four-wire leakage circuit breaker should be selected for electrical equipment powered by three-phase three-wire 380V power supply.
Difference between leakage circuit breaker and leakage protector
Circuit breaker: The circuit breaker is the on-off switch of the control circuit. If air is used as arc extinguishing medium, it is called air switch, and if sf6 gas is used as arc extinguishing medium, it is called sulfur hexafluoride circuit breaker. Circuit breakers generally use rated current (load) as the main switch of the circuit.
Leakage protector and leakage protection switch:
Leakage protector and leakage protection switch: when an air switch has leakage protection function, it is called leakage protection switch. If it is an electrical appliance only for leakage protection, it is called a leakage protector. Leakage protector, because it has no manual switch mechanism.
The principle basis for judging whether there is leakage is: leakage protector, which detects the "inflow" and "outflow" of power supply, because the current on live wire is equivalent to the outflow point of power supply, while the current on neutral wire is equivalent to the "inflow" point of power supply. When there is no leakage in the circuit, the current flowing into and out of the power supply is equal in magnitude and opposite in direction, but when there is leakage in the circuit, the current flowing back to the power supply from the zero line should be less than the current flowing into the power supply circuit.
The current flowing into and out of the switch must be equal, otherwise it is judged as leakage. When the leakage current reaches and exceeds a certain level, the protection action-trip occurs. The threshold of decision-making can be set, because the circuit is designed by scientists. Just choose protectors with different sensitivities according to different occasions. Residual current refers to the vector sum of instantaneous values of current flowing through the main circuit of residual current protection device (zero sequence transformer), which is expressed by its effective value. For single-phase lines, the residual current is the leakage current to the ground of this phase; For three-phase lines, residual current is the vector sum of instantaneous values of each phase current, which is expressed by its effective value.
The leakage circuit breaker is essentially a plastic case circuit breaker with leakage detection elements, which is mainly composed of a plastic case, an operating mechanism, a contact system, an arc extinguishing chamber, a tripping device, a zero-sequence current transformer and a test device.